Two-way plow



March 14, 1944.

W, H. TANKE TWO-WAY PLOW Filed Feb. 8, 1941 5 Sheets-Sheet 1 Mar ch 14,1944.

W. H. TANKE TWO-WAY PLOW Fild Feb. 8, 1941 5 Sheets-Sheet 2 March 14,1944. w. H. TANKE .7 2,344,474

TWO WAY PLOW Filed Feb. 8, 1941 5 Sheets-Sheet 3 March 14, 1944. I w. H.TANKE TWO-WAY PLOW I Filed Feb. 8, 1941 5 Sheets-Sheet 4 March 14, 1944.w. H. TIANKE 2,344,474

TWO WAY PLOW Filed Feb. 8 L 1941 5 Sheets-Sheet v5.

Patented Mar. 14, 1944 TWO-WAY PLOW Willard H. Tanke, La Crosse, Win,alsignor to I Allis-Chalmers Manufacturing Company, Mllwaukee, Wia,

a corporation of Delaware Application February a, 1941, Serial No.371,903

6 Claims.

' This invention relates to plows and it is primarily concerned withthat class of plows known as two-way plows having oppositely disposedplow bottoms adapted for alternate operation.

It is an' object of the invention to provide an improved liftingmechanism for a plow, which will, during the raising of the plow, shiftthe plow laterally from its line of draft with the tractor and which,uponlowering of the plow, will permit it to return to a working positionon its line of draft with the tractor.

A further object of the invention is to provide an improved liftingmechanism for a plow which will prevent the plow bottom from swinginginwardly toward its line of draft with the tractor, when it is raised toinoperative or transport position. In .a two-way plow the maintenance ofthe inoperative plow bottom in a raised or transport position laterallyof its line of draft with the tractor permits. the free and unobstructedoperation of the operative or working plow and eliminates interferencebetween the two plow structures.

A further object of the invention is to provide an improved liftingmechanism for a plow which will hold the plow, when in a raised ortransport position, in a laterally shifted position relative to thetractor so as to permit the free and unobstructed operation, of thetractors rotary power takeoff mechanism.

A further object of the invention is to provide an improved liftingmechanism for a plow which allows relatively free lateral movement ofthe plow relative to the tractor when in working position and restrictedlateral movement of the plow when raised to a transport position.

A still further object of the invention is to provide a mechanism forshifting a plow laterally of its line of draft with a tractor during theraising of the plow, which mechanism is simple in construction, durablein use, and cheap to manufacture.

The foregoing and otherobjects and advantages of the invention and theoperation of a device constructed in accordance therewith will beapparent from the following description of a preferred embodiment of theinvention. Referring to the accompanying drawings forming part ,of thisspecification and in which like reference characters designate the sameor similar parts in the various views:

Fig. l is a perspective three-quarter rear view of a tractor operatedtwo-way plow with a right hand plow in ground entering positi'omand athe machine shown in rear portion of the tractor only, part of thelatter being cut away to expose details of the plow attachment. Theplows are in the same relative position as shown in'Fig. 1;

I Fig. 5 is a top view of the tractor operated two-way plow showingthe'rear of the tractor only and having part of the tractor omitted toexpose details of the plow attachment;

Fig. 6 is, a detail view of the left hand lifting bailtaken on line Vi-VI in Fig. 5; I

Fig. 7 is a detail view of a plow leveling m her, a portion of which isbroken away to expose part of the lifting bail structure; 7

Fig. 8 is a detail view of an eye of the lifting bail to which acontractable and extensible link is attached, the view being taken frombelow the ball when the plow is in ground-entering position as shown inFig. 2;

Fig. 9 is a detail view of the eye shown in Fig. 8, the view being-takenfrom the rear of the ball when the plow is in ground entering positionas shown in Fig. 2; v

- Fig. 10 is a detail view, in section, showing parts of the extensibleand contractable link in a position occupied by the latter when theright hand plow is in ground working position, as I shown in Fig. 3: and

Fig. 11 is a detail view, in section, showing parts of a link similar tothe one shown in Fig. 10, in a position occupied when the left hand plowis in a raised or transport position, as seen in Fig. 3.

Fig. 1 shows a tractor operated plow comprising a conventional wheeltype farm tractor,

which constitutes a traveling support, and a two- I way plow attachmentmounted thereon for plowleft hand plow in raised or transport position;5

character 8,

ing a field in the usual manner.

The body of the tractor is generally indicated by the referencecharacter I and is supported at its front end by a steering, truck andassociated closely spaced front wheels. not shown, and at its rear endby a pair of transgersely spaced rear wheels, the right rear wheel beingdesignated by the character 2 and the left reafwheel by the prisin Thebody of the tractor comprises an engine, torque tube 5, and a rear axlestructure 6 upon which the rear wheels 2 and 3 are mounted. As is usualin farm tractors of the wheel type the rear axle structure is ofconsiderable transverse width so as to accommodate in the space betweenthe rear wheels the structures of the various implement attachments,such as a two-way plow, that may be connected to the tractor.

The rear axle structure 6 has, spaced on each side of its centralportion 1, upwardly extending bosses 9 having horizontal supportingsurfaces adapted to retain forwardly and rearwardly extending anglemembers 9 disposed longitudinally of the tractor, and at each sidethereof. The angle members 9, together'with associated transversemembers l and II. only the forward one of which is shown in solid linesin 'Fig. 5, form a fram generally indicated by the reference characterl3, at the rear of the tractor i, which not only serves as a means formounting a seat |l, back rest l5, and a pair of fenders i6, but alsoacts as a supporting structure for a two-way plow attachment. Thetwo-way plow attachment has a right hand and a left hand plow, l1 andi9, respectively. the right hand plow comprising a forwardly extendingtool support in the form of a plow beam l1, to the rear end of which isrigidly secured a right hand plow bottom 29, and the left hand plow i9coma forwardly extending tool support or plow beam i9, to the rear endof which is ri idly secured a left hand plow bottom 2|. Colters 22 and23 are movably fastened respectively to the right hand and left handplows I1 and- IS. The plow beams l1 and i9 are universally connected tothe tractor at their forward ends. a suitable structur to afford hitchpoints for the plow beams comprising a hitch ball 25, a fixed transverseshaft 25' on the hitch bail and a pair of rearwardly extending arms 26which are pivotally connected to depending brackets 28 secured to thefinal drive housing 29 of the rear axle structure 5, the connectionbeing made by means of pivot pins 21, as best shown in Fig. 4.

The frame l3, as shown in Fig. 5, has at its rear a pair of arcuatebrackets 3| and 32 on which outwardly disp sed bearing sleeves 33 and 35are formed integrally with the central portions of the brackets,respectively, the right. hand bracket having an upwardly and forwardlyextending arm 35. The base of each bracket is bolted at fore and aftspaced points to the upwardly extending flanges of the angle members 9at the respective sides of the tractor.

The arcuate brackets 3| and 32 not only serve as a base for a duallifting mechanism for'the plows n and I9. but the arm as of the righthand one also acts as a support for the operat- I 1 8 lever of the hitchbail vertical adjustin mechanism. Pivotally connected to the arm 35 ofthe right hand arcu'ate bracket 3| is a bell crank lever 31 comprising,a short portion 39. and a hand lever portion 39 welded thereto near theformers center and extending substantially at right angles thereof. Thehand lever 39 is equipped with the usual detent mechanism comprising agrip l9, latch rod 4|, and latch 43, the

latter being pivotally connected with the forward half of the shortportion 39 of the bell crank lever at 42 and engaging with a forwardlextending toothed segment 44 securely attached to the arcuate bracket3|. A spring 45 connected at one end to the arm 35 of the bracket and atthe other end to the latch 43 retains the latter in engagement with thetoothed segment 44 and holds the hand lever 39 in any predeterminedposition.

The bell crank lever 31 is connected to the hitch bail 25 through aseries of linkages, as

shown in Fig. 4, comprising a link 46 which is thereto, the shaft beingsuspended beneath the front member "I of the tractor frame. Transverselyspaced from the first arm 41 is a forwardly extending second arm. 5||rigidly secured to the rock shaft 49 and having a pivotal connection atits outer end with a downwardly ex-- tending link 5|. As shown in Fig.4, the link 5| has-a series of vertically spaced holes 52 at its upperend by which it is vertically adjustable about its pin connection 53with the outwardly extending second arm 59. The lower end of thedepending link 5| is pivotally connected to a central portion of thehitch ball 25. When the hand lever 39 is rocked to and frolongitudinally of the tractor, the hitch ball 25 is raised and loweredvertically about its'mvotal connection 21 with the depending brackets 28mounted on the drive housings- 29 of the rear axle structure 5. The twooppositely disposed plows I1 and I9 have the forward ends of their plowbeams l1 and I9 pivotally connected to the hitch'bail 25 so that upwardand downward movement of the bail will correspondingly raise or lowerthe forward end of the plow beams l1 and I9, thereby adjusting the depthof cut of the working plow.

Referring to Fig. 5, theforward ends of the plow beams l1 and I9 beingidentical. the description of'the connection of the right handone IIwith the hitch bail 25 will sumce to describe the connection of the lefthand beam l9 with the same hitch bail. The connection of the plow beam Hto the hitch bail comprises a U-shaped strap 55 passing around andengaging with the fixed transverse shaft 25', the ends of the strapextending rearwardly and horizontally to form a bracket 51 in which theforward end of the beam i1 is movably connected by means of a verticallydisposed pivot pin 53 passing through the bracket 51 and the beam. Thepivotal connection thus formed permits the plow beam II to be freelyswung about the pivot pin 53 laterally of the tractor. Thecross-sectional area of the space enclosed by the U-shaped strap 55 isappreciably larger than the cross-sectional area of the fixed shaft 25',so that the plow beam may have a limited twisting movement about its own10 'tudinal axis. Such movement permlts the plow H to be leveled 0rwinged when cutting furrows of appreciable depth, or when working alongthe side of a slope where the tractor is subject to tilting. Fastened tothe fixed shaft 25' on each side' of the U-shaped connectin strap 55 areadjustably movable collars 59 which prevent the point of connection ofthe plow beam H from being shifted laterally diu'ing operation of theplow l I.

The dual lifting mechanism for raising and lowering the plows l1 and I9is mounted on the rear of the tractor frame i3 and comprises a rockshaft. which extends transversely of the leg 67 to the shaft M, the

tractor and beyond the limits of the tractor frame, as shown in Fig. 2.The rock shaft 6| is iournaled in the bearing sleeves 33 and 34 whichform part of the arcuate brackets 3| "and 32 and is freely rotatabletherein. Mounted on the outer ends of the rock shaft 6| are sleeves Biland 60 respectively equipped with a pair of arms of unequal length, asshown in Fig. 1, which form no part of this invention and are omitted inthe other views for the sake of clarity. The sleeves 60 and 60' arenon-rotatably secured to the shaft 6| in axially fixed positions andabut the bearing sleeves 33 and 34, respectively, for prevent-' ingaxial displacement of the shaft 6| relative to the tractor.

Securely attached to the rock shaft near the right hand bearing sleeve33, and within the space delineated by the two arcuate brackets 3| and32, are a pair of depending-closely spaced,

'arcuate arms 62, as shown in Figs. 2 and 4. The

curvature of the depending arms 52, being directed downwardly andforwardly relative to the tractor from their point of origin with theshaft 6|, causes the ends of these arms to describe an arc when theshaft is rotated, whose trace lies for a portion of its distance beneaththe shaft.

Detachably secured to the right hand portion of the rock shaft 6!, atright angles'thertto, is a bail 63 having its outer leg rigidly fastenedby means of bolts 65 t the exterior surface of the outer depending arm62, and its inner leg 61 connected to a short arm 68 secured to theshaft in axially spaced relation to the outer depending arm 62, as shownin Fig. 5. The inner leg 61 is bolted to the short arm 68, and has aconcave recess at its end adapted to engage the convex surface of theshaft 66. Thus, only one bolt 69 is needed in the latter connection tosecure the curvature of the engaging surfaces coacting to retain the legin position relative to the shaft. When so mounted, the bail 63 andshaft ti form an integral unit and any oscillatory movement imparted tothe shaft will result in an upward or downward movement of the bailabout the axis of the shaft as a center.

Referring to Fig. 5, a second bail Hi is detachably fastened to the lefthand. portion of the rock shaft 6i and extends radially therefrom forupward and downward movement about the axis of the shaft as a center. Itshou d be particularly noted that the second' or I ft hand bail it!hinges on the shaft 6| so as to be freely mov able relative thereto andthat any oscillatory movement of the shaft is entirely independent ofmovement of the bail. Correspondingly the left hand bail ill may berotated about the rock shaft ti without causing any movement of thelatter.

The legs H and 12 of the second bail 10 are notched at the lower sidenear their ends, asp shown in Fig. 6; a notch 13 engaging with the shaftand movably retaining the bail thereon. A locking plate it, similarlynotched, is securely fastened to each of the bail legs H and 12 by boltst5, the notch of the locking plate engaging with the shaft 6| inopposition to the notch i3 in-the bail leg, so that the aperture thusconstructed has a complete periphery and forms a. suitable bearing forthe bail 10 on which it is rotatable about the shaft. Secured to therock shaft 6| on the inner sides of the left hand bail legs H and it arecollars it which act as stops to prevent any transverse movement of thebail 70 along the shaft.

The outer leg I2 of the left hand lifting bail 10 has rigidly secured toits inner surface, by welding, a downwardly and forwardly extendingarcuate arm 17, as shown in Fig. 6, which is similar to one of the pairof depending arms 62 afflxed to the right hand portion of the rock shaft6|. A second arm 18, at the inner side of the arm 11 has an upperportion welded to the first arm 11 at a short distance from the lowerend of the latter, the two arms forming a fork.

In order to elevate or depress the right hand and left hand liftingballs 63 and I0, a pair of hydraulic rams l9 and are respectivelymounted beneath the tractor frame l3 on each of the angle members 9 andto the rear of the rear axle structure 6, as best shown in Fig. 5. Therams I9 and 80 he parallel to the angle members 9 and extend rearwardlyrelative to the ing connection respectively with its associated liftingbail. The piston 82 of the right hand ram 19 is pivotally connected bymeans of a pivot pin 19' with the bracket formed by the arms 62 and hasits end lying in the space between the ends of the depending arms 62.Actuation of the piston 82 of the right hand ram 19 for to and fromovement within the cylinder 8| causes the ends of the depending arms 62to swing from one side of a vertical plane through the axis of the shaft6| to the other, and to oscillatethe right hand bail 63 and the shaft 6iabout the axis of the latter; The piston 82- of the left hand ram 80 ispivotally connected by means of a pivot pin 80 to the fork formed arm Tiof the left hand bail 10 whereby reciprocal motion of the piston withinits cylinder 8| causes oscillatory motion of the bail 10.

draulic rams l9 and 80, a service pump is located in a power take-offhousing 85, attached to the rear axle structure 6, which housingencloses a suitable mechanism drivingly connected with the tractorengine for driving the pump. The pump is provided with a primary valve85' adapted for-on," "off or drain positions, the valve being operablefrom the driver's seat I4 by means of the rod 92 connected with thevalve mechanism. Inasmuch as the two rams I9 and 80 are operatedindependently,.a secondary or control valve 81 is interposed between theprimary valve 85' and the rams, and is mounted beneath the frame Iadjacent the forward portion of the seat I4. An operating lever 88 isconnected to the valve 81 and extends upwardly in front of the seat M. Ashort length of flexible conduit 86 connects the primary valve 85' withthe control valve 87; and the latter is connected to each of the ramcylinders 8i through flexible conduits 89, the connection being madenear the point of the rams pivotal connection 83 with the tractor frame.

The primary valve has two functions; one to supply fluid under pressureto the secondary position in which the valve block any movement on thedepending 4 of fluid to and from the rams. Thus it can be seen that thesecondary valve 81 acts as a conother and it is thought that thecomplete and full description of one such structure will suffice todescribe the other and fully explain the invention.

The right hand bail 63 has abutting the outer surface of its centralportion and extending transversely of the tractor a leveling or wingingmember 93, as best shown in Fig. '1, fastened through its center to thecentral portion of the bail by means of a pivotal connecting bolt 99.Spaced on either side of the centrally located connecting bolt 99 andtransversely of the leveling member, are a pair of adjusting bolts 95which pass respectively through apertures in the leveling member 93 toengage with a pair of vertically disposed slots 91 in the bail 93, asshown in Fig. '1. A nut 99 and lockwasher cooperate with each bolt tohold the leveling member 93 securely against the bail 63 in apredetermined angular relationship relative thereto which angularity islimited only by the length of the vertical slots 91 in the bail. Inother words, the leveling member 93 is rotatable about the centralconnecting bolt 99 and may be adjusted an gulariy relative to the bail93.

The ends of the leveling member 93 are respectively formed into eyes 99which extend outwardly and rearwardly therefrom in relative parallelrelation, and a pair of depending links I99 are looped, respectively,through the eyes 99. The links I99 are of equal length, and are freelyswingable within the eyes 99 of the leveling member 93. They extenddownwardly in parallel relation and are universally connected at theirlower ends to atransversely disposed tool supporting member I9 I thelinks I99 being looped at -the lower ends through upwardly extendingeyes I93, respectively, at the'opposite ends of the tool supportingmember II. For purposes of definition the bail 63 and its associatedleveling member 93 may be con'sidered'as constituting two rock arms, afirst one comprising the outer leg 69 and the outereye 99, and a secondone comprising the inner leg 61 and the inner eye 99, and it will beseen that the-two rock arms are swingabie in unison about the axis ofthe shaft .6I, and are spaced from each other axially of said shaft. Theouter link I99 constitutes a raising and lowering means connecting thetool support or plow beam I1 with the first rock arm at a predeterminedradial distance from the axis of the shaft 6|.

The right hand plow beam I1, is connected rearwardly of its point ofconnection with the hitch bail 25, with the tool supporting member MI inrelatively close proinmity to the inner eye, I93 and at a substantialdistance from the outer eye I93, a pair of U-bolts I94 passing aroundthe beam fore and aft of the tool supporting member and engaging with alocking plate I95. Two nuts I95 and associated lockwashers respectivelyserve to hold the U-bolts I94 and locking plate I95 in place.

As heretofore mentioned, the lifting structure depending from the lefthand ball 19 is a mirror-image of that depending from the right handbail 69 and the following description which has reference to details ofthe right hand lifting structure'is equally applicable to the lefthandlifting structure, it being kept in mind that the structure at the leftside of the tractor is an opposite hand duplicate of the one at theright side of the tractor.

when the hydraulic ram 19 is operated by' admission of pressure fluidinto the ram cylinder M the right hand plow I1 is moved from the workingposition in which it is shown in Fig. 3, to a laterally offset transportor inoperative position as illustrated by the position of the lefthandplow I9 in the same figure. That is, while the plow I1 is swungupwardly about the horizontal axis of the shaft 39' of the hitch bail25, it is simultaneously swung laterally on the pivot pin 59 inadirection towards the right tractor wheel 2. This result isaccomplished by means of an extensible and contracta-ble link I96,having coaxial slidable portions, which are shown in detail in Fig. 10,and the operation of which will be discussed more fullyfhereinbelow. Thelink I99 is universally connected at one end to an eye I91 (Figs. 8, 9)protruding from the underside of the inner leg 61 of the ball 63 at apoint intermediate the shaft 6i and the loop of the bail, anti at theother end the link I96 is universally connected to an outwardly andlaterally disposed eye I99 of the tool supporting member I9I. Ifreference is had to a rear view of the lifting mechanism as seen in Fig.3, it will be noticed that the extensible and contractable link I96, oras it will be known hereafter, the telescopic link, lies in a diagonalposition relative to the depending links I99, as seen along a linenormal to the plane of the depending links and passing between them. Itshould be particularly noted that the radial distance measured from therock shaft 6| along the inner leg 61 of the bail 63 to the point ofconnection between the latter and the telescopic link I96 is not equalto the radial distance measured from the shaft along the same leg to thepoint of connection between the adjacent end of the leveling member 93and the upper end of the inner depending link I99. The telescopic linkI99 comprises a male element H9 and a female element III, the latteradapted to receive the former in slidable engagement therewith and soconstructed as to remain in substantially coaxial relation for anyengaging position relative thereto.

The female element III consists of a hollow cylindrical member open atone end and closed at the other by means of an eye bolt III which issecurely fastened thereto. The shank end I II of the eye bolt 2 fitsinto and penetrates the bore of the element III for a short distance, asshown in Fig. 10. The coupling end of the eye bolt II! is universallyconnected with the tool supporting member III, as heretofore described.That is, the female element III is swingable lengthwise and transverselyof the tool support or plow beam I1 at a point in laterally fixed retothe inner leg 61 of the bail 63, as heretofore mentioned, and the otherend merely terminates to form afree end 5. The male element H is freelyslidable, within limits in the female element III, the limiting ortelescoped position between the two elements being reached when the freeend IIof the male element abuts the closed end of the female element. Insuch a position further inward telescopic movement is impossible.

If reference is had to Fig. which is a detail view of the relativepositions of the male and female elements of the telescopic link I06when the right hand plow I! is in a round working position, as shown inFig. 3, it will be seen that the free end II5 of the male element IIOdoes not abut the closed end of the female element III, the spacebetween the two being clearly defined. It will be further noted withrespect to the entire lifting structure, as. shown in Fig. 3, that fourof its parts: namely, the leveling member 03, the two depending linksI00 and the tool 2,344,474 shown in Fig. 4,.which is universallyconnected at a radial distance from the shaft 6| difierent from theradial distance of the point of connection of the depending links withthe leveling member.

For. the purposes of explanation, the axis of the shaft 6|, the axis onwhich the eyes 99 are alined, the axis on .which the eyes I03 arealined, and the axis of the shaft on the hitch bail 25 may be consideredas the pivot axes of a quadrilateral link structure, best shown in Fig.4, and it will be seen that one of the diagonals of said link structure,namely, the one between' the axis of the shaft BI and the axis on whichthe eyes I03 are alined, becomes shorter, and that the other diagonal,namely, the one between the axis of the shaft 25' and the axis on whichthe eyes 99 are alined, becomes longer when the bail 64 is swungupwardly from the mentioned position by rotation of the shaft 6|. As aresult, the telescopic link I06, whose relatively slidable elements areconnected, respectively, withsaid quadrilatsupporting member IOI,. forma parallelogram and that the telescopic link I06 while not lying in theplane of the parallelogram is disposed diagonally relative to the latterand has its trace in a plane very nearly coincident with one of thediagonals of the parallelogram.

If the lowered or ground working plow II meets with an obstruction inthe'ground which .tends to shift it laterally of the tractor theaforementioned parallelogram will assume a new shape compared with itsconfiguration prior to the shift, and the telescopic link I06, becauseof its peculiar diagonal relationship with the parallelogram, willeither be elongated or contracted depending on the direction of thelateral shift. Sufiicient space is left between the two portions of thetelescopic link I06 in order to allow for further inward telescopicmovement if the shift is in a direction tending to foreshorten the link.It will be seen from the action described that the plow I1 is freelyswingable laterally while in the ground and that the action of,telescopic link I06 does not objectionably interfere with this lateralswinging motion. f s

If the plow I1 is now lifted out of the ground by elevating the'righthand ball 63 so as to swing the bail and leveling member 93 in an areabout the axis of th rock shaft 6I, it will be apparent that, as theangle between the leg 61 of the bail and the depending link I00 isdecreased, the end points of the telescopic link I06 will begin'toapproach each other, and the distance as measured between the two pointswill begin to decrease. This contraction of the end points of theteleeral link structure at points which tend to approacheach other whenthe quadrilaterallink structure changes its configuration due to thementioned upward movement of the ball 63, is

constantly subject to a contracting force during the lifting movement ofthe bail 63 from an ini tial starting position with the plow I! in theground to a final position with the plow in the air. But as heretoforedescribed, the structure of the telescopiclink I06 will not permit ofits indefinite contraction during the elevation of the bail 63 andeventually a point is reached in the bails upward movement when the maleelement 0 of the telescopic link abuts the closed end of the femaleelement III and further contracting motion of the link is impossible.This point occurs shortlyafter the plow I1 is raised out of the groundand long before it reaches its transport position. When the lifting ball63 reaches a position where the telescopic link I06 is no longercontractable, further upward movement of the bail will result in alateral shifting movement of the plow I1 and tool supporting member IOIsince the distance between the two end points of the telescopic link isnow greater than the distance which would separate the points if thetelescopic link were indefinitely contractable. ,The telescopic link I06must be accommodated in the lifting structure between its two end pointconnections therewith and since during elevation of the liftingstructure the telescopic link becomes in effect a non-contractable rigidmember and its upper point of connection with the ball 63 cannot shiftlaterally, the lower point of connec- T tion with the tool supportingmemberl0l must scopic link I06 may be more readily visualizedsubstantially vertical plane. The telescopic link I 06, as heretoforenoted, is disposed diagonally relative to the parallelogram formed bythe leveling member 03, associated depending links I00,

should again be recalled that the point of conand the toolsupporting-member IN; and it oruie telescopic link with the ball 63 ismove outwardly laterally to effect such accommodation.

- From the foregoing description it will be seen that the male elementIIO of the telescopic connection I06 cooperates with the second rock arm61, at a point on the latter which is spaced from the axis of the shaft6| a different radial distance than the swinging center of the outerlink-I00 on the first rock arm 64, 99, and with the female element III,to swing the latter lengthwise, that is rearwardly, and transversely,that is downwardly, relative to the plow beam I1 and to simultaneouslyforce said "female element in a direction to transmit side thrust to theplow beam II, by swinging movement of said rock arms about the axis ofthe shaft 6|.

The outward lateral shift of the tool supporting member IOI will swingthe plow I'I laterally of its line. of draft with the tractor and sinceit is moving vertically at the same time, it 'will be displaced upwardlyand outwardly to a position opposed to that of the left hand plow it,which is shown raised in Fig. 2. At the completion of this upward andoutward movement relative to the tractor, the plow ll will'be retainedin a final position, similar to the opposed position assumed by the'lefthand plow it, by the rigid and no longer contractable telescopic linkI08. Thus the inoperative plow is prevented from swingin inwardly whilein the raised or transport position and the danger of such inwardswinging damaging the two structures is avoided.

This is of particular importance when the tractor is moving along thecontours of a slope with the downhill plow in a ground engaging positionand the uphill plow in a raised or transport position. Under theinfluence of gravity there is a tendency for the uphill plow to swingtoward the downhill plow and interfere with the operation of the latter.In this invention the telescopic link it. retains the raised plowagainst swinging inwardly toward the lowered or working plow and allowsthe lowered plow to be freely swingable laterally in its workingposition. Furthermore, the movement of the inoperative plow verticallyand laterally of its operative position to a dia onally displacedtransport position prevents the collection on the inoperative plowstructure of grass mat and trailing vines which avoid the cuttin actionof the colter mounted ahead of the working plow and are thrown upward bythe action of th plow bottom.

Referring to Fig. 4, a power takeoff drive shaft m extends rearwardlyfrom the central portion 'I of the rear axle structure 6 and isdrivingly connected with the tractor engine for rotation by the latter.Should it be desired-to make.

use of the power takeoff in order to run some machine external to thetractor it is not necessary to disconnect the two-way plow attachment.The two plows l1 and I! are merely raised to transport position and thespace provided by the vertical and lateral displacement of the plows isadequate to permit a pulley drive or a shaft coupled drive to befastened to the power takeoff shaft ii. and operated in a free andunobstructed manner.

In the operation of the two-way plow the driver sits upon the seat ll ofthe tractor and by manipulation of first-the primary valve through therod '2 and handle ll and secondly the secondary valve 81 through itsoperating lever II he is able to alternately raise or lower the plows i1and II ormaintainthem in anypredeterminedvertical position including theraised or transport position.

The two-way plow attachment is detachably connected to the tractor, andto effect the detachment thereof it is simply necessary to perform a fewdisconnecting operations herein now to be described, the plows l1 and I!first bein lowered into a ground engaging position. The plow beams i1and II may then be detached from the hitch ball 25 by removing thevertical pivot pins 58 and moving the ends of the beams laterally out ofthe brackets 51. Next the pivot pin ll which connects the the liftingbail II is removed.- The right hand ball 63 is disconnected from therock shaft Ii by removing the bolts 85 and 6! securing it respectivelyto the depending arms '2 and the proiecting. lug ii. Theleft hand bailII is disconnected from the rock hydraulic ram ll with shaft Si byremoving the 15 said transverse member simultaneously lengthbolts IIwhich secure the locking plates 14 to the bail legs Ii and I2 anddisengaging the legs from their notched engagement with the shaft. Thetractor may then be driven forwardly away from the plows l1 and illeaving the attachment on the ground as disconnected.

To connect the two-way plow attachment to the tractor, it is merelynecessary to reverse the aforesaid procedure and drive the tractorrearwardly over the plows II and il until the tractor bitch}! and therear frame I; are in a suitable position relative to the plow beams l1and It to effect a hitch with the latter.

While in the foregoing a preferred embodiment of the invention has beendescribed and shown as relating to two-way plows, it should beunderstood that it is not intended to limit the invention to two-wayplows, and the invention might equally well be applied to one-way plowshaving a single plow beam. It should be further understood that it isnot intended to limit the invention to the exact details of constructionherein disclosed, because various modifications within the scope of theappended claims may occur to persons skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. In a lift mechanism for agricultural implements; a rock shaft, firstand second axially spaced arms mounted on said shaft. first and seconddepending links connected, respectively, to said arms at predeterminedradial spacings from the axis of said shaft, a transverse'memberconnected to said first and second depending links for lengthwiseshifting movement axially of said shaft, a first link sectionuniversally swingable about a center on said second arm at a differentradial spacing from the axis of said shaft than said second dependinglink, anotherlink section universally swingable about a center fixed onsaid transverse member near the point of connection of' said firstdepending link with said transverse member, said first and second linksections being connected with each other for relative movement in thedirection of a line extending through saidcenters, and means to limitrelative movement of said link sections, whereby rocking movement ofsaid shaft will be effective to move wise and vertically relative tosaid shaft.

2. In combination, a tractor, a plow beam hav- "My ing forward hitchconnection with said tractor, and means for swinging said plow beamabout said hitch connection comprising a transverse rock shaft mountedon the tracto'r first and second axially spaced arms mounted on saidshaft, first and second depending linksnoonnected, respectively, to saidarms at predetermined radial spacings from the axis of said shaft, atransverse member connected with said plow beam and having connectionwith said first and second depending links for lengthwise shiftingmovement of said transverse member axially of said shaft, a first linksection universally swingable about a 1 center on said second arm at adifferent radial spacing from the axis of said shaft than said seconddepending link, another link section universaiiy swingable about a fixedcenter on said transverse member near the point of connection of saidfirst depending link with said transverse member, said first and secondlink sections having integral portions, respectively, cooperating witheach other'to guide said second link section on said first link sectionfor sliding movement relative thereto in the direction of a lineextending through said centers, and means to limit relative slidingmovement of said link sections, whereby rocking movement of said shaftwill be effective to move said transverse member and said lplow beamsimultaneously lengthwise and vertically relative to said shaft.

3. In an agricultural implement, a traveling support having a hitchpoint, a first'rock arm swingable on said traveling support about anaxis spaced from said hitch point, a second rock arm swingable aboutsaid axis in unison with said first rock arm and spaced from the latterlongitudinally of said axis, a tool support universally connected withsaid traveling support at said hitch point and extending transversely ofsaid axis, raising and lowering means connecting said tool support withsaid first rock arm at a point on the latter spaced a predeterminedradial dis-' tance from said axis, an element swingable lengthwise andtransversely of said tool support at a point in laterally fixed relationto the latter and in spaced relation to said hitch point, and anotherelement cooperating with said second rock arm at a point on the latterspaced from said axis a'difierent radial distance than said point onsaid first rock arm, and with said first mentioned element to swing thelatter lengthwise and transversely of said tool support and tosimultaneously force said first element in a direction to transmit sidethrust to said tool support by swinging movement of said rock arms aboutsaid axis.

4. In an agricultural implement, a traveling support having a hitchpoint, a first rock arm swingable on said traveling support about antudinally of said axis, a tool support universally connected with saidtraveling support at said hitch pointand extending transversely of saidaxis, raising and lowering means connecting said tool support with saidfirst rock arm at a point on the latter spaced a fixed radial distancefrom said axis, and means for swinging said tool support laterally aboutsaid hitch point, comprising a first link section pivotally connectedwith said second rock arm at a difierent radial spacing from said witheach other I direction of a line extending through their respectivepivot centers, and a stop on one of said link sections engageable by theother for limiting said relative movement of said link sections.

5. In an agricultural implement, a traveling support having a hitchpoint, a rockable structure comprising a first rock arm swingable onsaid traveling support about an axis spaced from said hitch point and asecond rock arm swingable about said axis in unison with said first rockarm and spaced from the latter longitudinally of said axis, a toolsupport connected with said traveling support at said hitch point andextending transversely of said axis, raising and lowering meansconnecting said tool support with said first rock arm at a point on thelatter spaced at predetermined radial distance from said axis, anelement swingable lengthwise and transversely of said tool support at apoint in laterally fixed relation to the latter and in spaced relationto said hitch point, and another element cooperating with said secondrock arm at a point on the rockable structure spaced from said axis adifierent radial distance than said point on said first rock arm, andwith said first mentioned element to swing the latter lengthwise andtransversely of said tool support and to simultaneously force said firstelement in a direction to transmit side thrust to said tool support byswinging movement of said rock arms about said axis.

6. Inan agricultural implement, a traveling support having a hitchpoint, a rockable structure swingable on said traveling support about anaxis spaced from said hitch point, a tool support connected with saidtraveling support at said hitch point and extending transversely of saidaxis, means connecting said tool support with said rockable structure ata first point on the latter spaced a predetermined radial distance fromsaid axis, an element swingable lengthwise and transversely of said toolsupport at a point in laterally fixed relation to the latter and inspaced relation to said hitch point, and another element cooperatingwith said rockable structure and with said first mentioned element toswing the latter lengthwise and transversely of said tool support and tosimultaneously force said first ment oned tance than said first pointand also spaced from i WILLARD H. TANKE.

